Direction : Study the following information and answer the questions that follow:

Vishal and Shekhar have some toffees initially. Everyday Vishal and Shekhar buy a fixed number of toffees. The number of toffees that they buy each day is different from other’s number. After 4 days, they have equal number of toffees. After 12 days Vishal has 8 (16/23)% more toffees than Shekhar. After 13 days, Sunidhi who has no toffee initially, took 6 toffees from Vishal and 3 toffees from Shekhar, as a result now Vishal has 6 toffees more than Shekhar. After 15 days, they all clubbed together their toffees and divided equally among the three. Now each of them has 71 toffees. Based on this information answer the questions that follows.